# std::ranges::take_while_view<V,Pred>::end

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< cpp‎ | ranges‎ | take while view

constexpr auto end() requires (!/*simple-view*/<V>); | (1) | (since C++20)
constexpr auto end() const requires ranges::range<const V> && std::indirect_unary_predicate<const Pred, ranges::iterator_t<const V>>; | (2) | (since C++20)

Returns a sentinel representing the end of the view.

Let `base_` denote the underlying view.

1) Effectively returns /*sentinel*/<false>(ranges::end(base_), std::addressof(pred())).
2) Effectively returns /*sentinel*/<true>(ranges::end(base_), std::addressof(pred())).

Overload (1) does not participate in overload resolution if `V` is a simple view (that is, if `V` and const V are views with the same iterator and sentinel types).

### Parameters

(none)

### Return value

A sentinel representing the end of the view.

### Example

| This section is incomplete Reason: no example

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 3450 | C++20 | the const overload might return a sentinel non-comparable to the iterator | constrained

### See also

begin | returns an iterator to the beginning (public member function)
operator== (C++20) | compares a sentinel with an iterator returned from `take_while_view::begin` (function)

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